Results of the ‘True Vista’ Bifocal IOL European Multicentre Study

Abstract

OBJECTIVE: To determine the quality of vision with the ‘True Vista’ bifocal IOL. STUDY DESIGN: Prospective multicentre study of postoperative results at 4–6 and 7–11 months after surgery. SETTING: Twenty ophthalmic centres in Europe participating. PATIENTS: 367 monocular implants performed to date; 164 adults (best cases) at 4–6 months and 73 at 7–11 months; contrast acuity tested in 67 patients (best cases). MAIN OUTCOME MEASURES: Uncorrected and best corrected distance and near acuity and contrast acuity (Regan Low Contrast Acuity Charts, 96%, 50%, 25%, 11%); near acuity measured by a Snellen chart (Lighthouse Chart) at 7–11 months and by reading charts at 4–6 months. RESULTS: At 4–6 (7–11) months best corrected distance acuity was 20/40 or better in 97% (99%), best corrected near acuity 20/30 or better in 91% (83%) and uncorrected near acuity 20/30 or better in 64% (59%). Near acuity (Lighthouse Chart) was slightly lower than reading acuity (reading charts) ( P = 0.12). Distance contrast acuity was slightly reduced at low contrast (11%) only, while contrast acuity at near focus was significantly lower than at far focus (96%: P = 0.0001; 50%: P = 0.0001; 25%: P = 0.001; 11%: P = 0.02). CONCLUSIONS: The design of the ‘True Vista’ bifocal IOL emphasizes the far focus, thereby providing good distance vision as distance vision is more important than near vision. The reduced resolution at near focus, despite of normal reading acuity, may be compensated by a near add when necessary.